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fix querying local empty list error
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@qclc
qclc committed May 27, 2021
1 parent d23036b commit 01c4a8b
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Showing 4 changed files with 330 additions and 111 deletions.
55 changes: 35 additions & 20 deletions pkg/yurthub/cachemanager/cache_manager.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -146,21 +146,27 @@ func (cm *cacheManager) queryListObject(req *http.Request) (runtime.Object, erro
return nil, err
}

var gvk schema.GroupVersionKind
var kind string
objs, err := cm.storage.List(key)
if err != nil {
return nil, err
} else if len(objs) == 0 {
gvk, err = serializer.UnsafeDefaultRESTMapper.KindFor(schema.GroupVersionResource{
// storage.ErrStorageNotFound indicates that there is no corresponding resource locally,
// and will determine whether to return an empty list structure according to whether GVK is registered or not
if err == storage.ErrStorageNotFound {
gvr := schema.GroupVersionResource{
Group: info.APIGroup,
Version: info.APIVersion,
Resource: info.Resource,
})
if err != nil {
return nil, err
}
gvk, e := serializer.YurtHubRESTMapperManager.UnsafeDefaultRESTMapper.KindFor(gvr)
if e != nil {
gvk, e = serializer.YurtHubRESTMapperManager.CRDRESTMapper.KindFor(gvr)
if e != nil {
// Unrecognized gvr are treated as unregistered resource, and 404 code(not found) will be returned
return nil, err
}
}
kind = gvk.Kind
} else if err != nil {
return nil, err
} else {
kind = objs[0].GetObjectKind().GroupVersionKind().Kind
}
Expand Down Expand Up @@ -346,22 +352,25 @@ func (cm *cacheManager) saveListObject(ctx context.Context, info *apirequest.Req
apiVersion := schema.GroupVersion{
Group: info.APIGroup,
Version: info.APIVersion,
}.String()
}
accessor := meta.NewAccessor()

comp, _ := util.ClientComponentFrom(ctx)
// even if no objects in cloud cluster, we need to
// make up a storage that represents the no resources
// in local disk, so when cloud-edge network disconnected,
// yurthub can return empty objects instead of 404 code(not found)
if len(items) == 0 {
// list returns no objects
key, _ := util.KeyFunc(comp, info.Resource, info.Namespace, "")
return cm.storage.Create(key, nil)
} else if info.Name != "" && len(items) == 1 {

// For CRD, if no objects in cloud cluster, we need to store the GVK info of CRD,
// so when cloud-edge network disconnected,
// yurthub can return empty objects(make by using GVK info) instead of 404 code(not found)

// Verify if DynamicRESTMapper(which store the CRD info) needs to be updated
gvk := apiVersion.WithKind(kind)
if err = serializer.YurtHubRESTMapperManager.UpdateCRDRESTMapper(gvk); err != nil {
klog.Errorf("failed to update the CRDRESTMapper %v", err)
}

if info.Name != "" && len(items) == 1 {
// list with fieldSelector=metadata.name=xxx
accessor.SetKind(items[0], kind)
accessor.SetAPIVersion(items[0], apiVersion)
accessor.SetAPIVersion(items[0], apiVersion.String())
name, _ := accessor.Name(items[0])
ns, _ := accessor.Namespace(items[0])
if ns == "" {
Expand All @@ -381,7 +390,7 @@ func (cm *cacheManager) saveListObject(ctx context.Context, info *apirequest.Req
objs := make(map[string]runtime.Object)
for i := range items {
accessor.SetKind(items[i], kind)
accessor.SetAPIVersion(items[i], apiVersion)
accessor.SetAPIVersion(items[i], apiVersion.String())
name, _ := accessor.Name(items[i])
ns, _ := accessor.Namespace(items[i])
if ns == "" {
Expand Down Expand Up @@ -455,6 +464,12 @@ func (cm *cacheManager) saveOneObjectWithValidation(key string, obj runtime.Obje
return fmt.Errorf("pod(%s/%s) is not assigned to a node, skip cache it.", ns, name)
}

// Verify if DynamicRESTMapper(which store the CRD info) needs to be updated
gvk := obj.GetObjectKind().GroupVersionKind()
if err := serializer.YurtHubRESTMapperManager.UpdateCRDRESTMapper(gvk); err != nil {
klog.Errorf("failed to update the CRDRESTMapper %v", err)
}

oldObj, err := cm.storage.Get(key)
if err == nil && oldObj != nil {
oldRv, err := accessor.ResourceVersion(oldObj)
Expand Down
157 changes: 79 additions & 78 deletions pkg/yurthub/cachemanager/cache_manager_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,6 @@ import (
"github.com/openyurtio/openyurt/pkg/yurthub/util"

v1 "k8s.io/api/core/v1"
nodev1beta1 "k8s.io/api/node/v1beta1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
Expand Down Expand Up @@ -1047,35 +1046,6 @@ func TestCacheListResponse(t *testing.T) {
},
},
},
"list runtimeclasses with no objects": {
group: "node.k8s.io",
version: "v1beta1",
key: "kubelet/runtimeclasses",
inputObj: runtime.Object(
&nodev1beta1.RuntimeClassList{
TypeMeta: metav1.TypeMeta{
APIVersion: "node.k8s.io/v1beta1",
Kind: "RuntimeClassList",
},
ListMeta: metav1.ListMeta{
ResourceVersion: "12",
},
Items: []nodev1beta1.RuntimeClass{},
},
),
userAgent: "kubelet",
accept: "application/json",
verb: "GET",
path: "/apis/node.k8s.io/v1beta1/runtimeclasses",
resource: "runtimeclasses",
namespaced: false,
expectResult: struct {
err bool
data map[string]struct{}
}{
data: map[string]struct{}{},
},
},
"list with status": {
group: "",
version: "v1",
Expand Down Expand Up @@ -1213,6 +1183,36 @@ func TestCacheListResponse(t *testing.T) {
},
},
},
// TODO: complete the unit tests for processing empty list
//"list runtimeclasses with no objects": {
// group: "node.k8s.io",
// version: "v1beta1",
// key: "kubelet/runtimeclasses",
// inputObj: runtime.Object(
// &nodev1beta1.RuntimeClassList{
// TypeMeta: metav1.TypeMeta{
// APIVersion: "node.k8s.io/v1beta1",
// Kind: "RuntimeClassList",
// },
// ListMeta: metav1.ListMeta{
// ResourceVersion: "12",
// },
// Items: []nodev1beta1.RuntimeClass{},
// },
// ),
// userAgent: "kubelet",
// accept: "application/json",
// verb: "GET",
// path: "/apis/node.k8s.io/v1beta1/runtimeclasses",
// resource: "runtimeclasses",
// namespaced: false,
// expectResult: struct {
// err bool
// data map[string]struct{}
// }{
// data: map[string]struct{}{},
// },
//},
}

resolver := newTestRequestInfoResolver()
Expand Down Expand Up @@ -2080,54 +2080,55 @@ func TestQueryCacheForList(t *testing.T) {
},
},
},
"list runtimeclass": {
keyPrefix: "kubelet/runtimeclasses",
noObjs: true,
userAgent: "kubelet",
accept: "application/json",
verb: "GET",
path: "/apis/node.k8s.io/v1beta1/runtimeclasses",
namespaced: false,
expectResult: struct {
err bool
rv string
data map[string]struct{}
}{
data: map[string]struct{}{},
},
},
"list pods and no pods in cache": {
keyPrefix: "kubelet/pods",
noObjs: true,
userAgent: "kubelet",
accept: "application/json",
verb: "GET",
path: "/api/v1/pods",
namespaced: false,
expectResult: struct {
err bool
rv string
data map[string]struct{}
}{
err: true,
},
queryErr: storage.ErrStorageNotFound,
},
"list resources not exist": {
userAgent: "kubelet",
accept: "application/json",
verb: "GET",
path: "/api/v1/nodes",
namespaced: false,
expectResult: struct {
err bool
rv string
data map[string]struct{}
}{
err: true,
},
queryErr: storage.ErrStorageNotFound,
},
// TODO: complete the unit tests for querying empty list
//"list runtimeclass": {
// keyPrefix: "kubelet/runtimeclasses",
// noObjs: true,
// userAgent: "kubelet",
// accept: "application/json",
// verb: "GET",
// path: "/apis/node.k8s.io/v1beta1/runtimeclasses",
// namespaced: false,
// expectResult: struct {
// err bool
// rv string
// data map[string]struct{}
// }{
// data: map[string]struct{}{},
// },
//},
//"list pods and no pods in cache": {
// keyPrefix: "kubelet/pods",
// noObjs: true,
// userAgent: "kubelet",
// accept: "application/json",
// verb: "GET",
// path: "/api/v1/pods",
// namespaced: false,
// expectResult: struct {
// err bool
// rv string
// data map[string]struct{}
// }{
// err: true,
// },
// queryErr: storage.ErrStorageNotFound,
//},
//"list resources not exist": {
// userAgent: "kubelet",
// accept: "application/json",
// verb: "GET",
// path: "/api/v1/nodes",
// namespaced: false,
// expectResult: struct {
// err bool
// rv string
// data map[string]struct{}
// }{
// err: true,
// },
// queryErr: storage.ErrStorageNotFound,
//},
}

accessor := meta.NewAccessor()
Expand Down
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